NF-κB在急性白血病患者骨髓细胞中的表达及其与P21,MMP-2和MMP-9表达的关系

本研究应用免疫细胞化学法检测初治急性白血病患者、缓解期患者及正常对照者骨髓细胞中NF κB ,Ras基因编码的P2 1蛋白及MMP 2和MMP 9表达阳性细胞的百分率 ,以明确核因子κB (nuclearfactor kappaB ,NF κB)在急性白血病细胞高表达的意义 ,及其与P2 1,基质金属蛋白酶 2和 9(matrixmetalloproteinase,MMP 2和MMP 9)表达间的关系。结果表明 :初治组NF κB ,P2 1及MMP 2和MMP 9的阳性率明显高于缓解组及正常对照组 (P <0 .0 5 ) ,而缓解组与正常对照组间没有显著性差异 (P >0 .0 5 ) ,且NF κB与P2 1蛋白 ,MMP 2和MMP 9表达均呈正相关 (r值分别为 0 .76 7,0 .72 9和 0 .80 3,P <0 .0 5 ) ,说明白血病细胞中NF κB及P2 1蛋白异常高表达。结论 :NF κB经Ras启动活化后可上调MMP 2和MMP 9在白血病细胞的表达 ,使其分解细胞外基质的能力明显升高而释放入血

Expression of Nuclear Factor-κB in Bone Marrow Cells from Patients with Acute Leukemia and Its Relationship with P21, MMP-2 and MMP-9

To investigate the expression of NF-kappaB in acute leukemia and its relationship with P21, and matrix metalloproteinases (MMP), the expression of NF-kappaB, P21, MMP-2 and MMP-9 in bone marrow cells from patients with acute leukemia (AL) was detected using immunocytochemical technique. The results showed that the expression ratios of NF-kappaB, P21, MMP-2 and MMP-9 in untreated AL group were significantly higher than those in remission and normal control groups (P < 0.05), and no obvious difference was seen between remission and normal control groups. The expression of NF-kappaB was correlated with that of P21, MMP-2 and MMP-9 (r = 0.767, 0.729 and 0.803, respectively, P < 0.05). This study indicated that P21 protein, encoded by oncogene Ras, and NF-kappaB were super-expressed in leukemia cells. In conclusion, after activation by Ras, NF-kappaB combined with the kappaB sequences of MMP-2 and MMP-9 genes, then upregulated their expression. MMP might enhance the degradative function of leukemic cell, thus to make cells easier to cross through the bone marrow barrier and release into blood.